Recommended Broken Links Checker?

One of my clients would like to include a large number of outbound links to the specification sheets held on the manufacturer's website. There are about 100 products affected, each needing a link to a specific tech sheet.

The manufacturer updates these spec sheets from time to time so we do not want to host copies on our own server for this reason.

When the manufacturer updates the spec sheet they also change the file name - e.g. product-a-spec-dec-2013.pdf - which would obviously cause a broken link at our end.

What I'm looking for is the equivalent of Pingdom but for links. A service that periodically crawls over the site and sends an email with a list of broken links. I don't want to have to go to a website and manually do it, I need something that runs in the background.